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/*
* Copyright (C) 2009 Alex Milowski (alex@milowski.com). All rights reserved.
* Copyright (C) 2010 François Sausset (sausset@gmail.com). All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(MATHML)
#include "RenderMathMLFraction.h"
#include "GraphicsContext.h"
#include "MathMLNames.h"
#include "PaintInfo.h"
namespace WebCore {
using namespace MathMLNames;
static const float gLineThin = 0.33f;
static const float gLineMedium = 1.f;
static const float gLineThick = 3.f;
static const float gFractionBarWidth = 0.05f;
RenderMathMLFraction::RenderMathMLFraction(MathMLInlineContainerElement& element, Ref<RenderStyle>&& style)
: RenderMathMLBlock(element, WTFMove(style))
, m_lineThickness(gLineMedium)
{
}
void RenderMathMLFraction::fixChildStyle(RenderObject* child)
{
ASSERT(child->isAnonymous() && child->style().refCount() == 1);
child->style().setFlexDirection(FlowColumn);
}
// FIXME: It's cleaner to only call updateFromElement when an attribute has changed. Move parts
// of this to fixChildStyle or other methods, and call them when needed.
void RenderMathMLFraction::updateFromElement()
{
// FIXME: mfrac where bevelled=true will need to reorganize the descendants
if (isEmpty())
return;
RenderObject* numeratorWrapper = firstChild();
RenderObject* denominatorWrapper = numeratorWrapper->nextSibling();
if (!denominatorWrapper)
return;
String thickness = element().getAttribute(MathMLNames::linethicknessAttr);
m_lineThickness = gLineMedium;
if (equalLettersIgnoringASCIICase(thickness, "thin"))
m_lineThickness = gLineThin;
else if (equalLettersIgnoringASCIICase(thickness, "medium"))
m_lineThickness = gLineMedium;
else if (equalLettersIgnoringASCIICase(thickness, "thick"))
m_lineThickness = gLineThick;
else {
// This function parses the thickness attribute using gLineMedium as
// the default value. If the parsing fails, m_lineThickness will not be
// modified i.e. the default value will be used.
parseMathMLLength(thickness, m_lineThickness, &style(), false);
}
// Update the style for the padding of the denominator for the line thickness
lastChild()->style().setPaddingTop(Length(static_cast<int>(m_lineThickness), Fixed));
}
void RenderMathMLFraction::addChild(RenderObject* child, RenderObject* /* beforeChild */)
{
if (isEmpty()) {
RenderPtr<RenderMathMLBlock> numeratorWrapper = createAnonymousMathMLBlock();
fixChildStyle(numeratorWrapper.get());
RenderMathMLBlock::addChild(numeratorWrapper.leakPtr());
RenderPtr<RenderMathMLBlock> denominatorWrapper = createAnonymousMathMLBlock();
fixChildStyle(denominatorWrapper.get());
RenderMathMLBlock::addChild(denominatorWrapper.leakPtr());
}
if (firstChild()->isEmpty())
downcast<RenderElement>(*firstChild()).addChild(child);
else
downcast<RenderElement>(*lastChild()).addChild(child);
updateFromElement();
}
void RenderMathMLFraction::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
RenderMathMLBlock::styleDidChange(diff, oldStyle);
for (RenderObject* child = firstChild(); child; child = child->nextSibling())
fixChildStyle(child);
updateFromElement();
}
RenderMathMLOperator* RenderMathMLFraction::unembellishedOperator()
{
RenderObject* numeratorWrapper = firstChild();
if (!numeratorWrapper)
return nullptr;
RenderObject* numerator = numeratorWrapper->firstChildSlow();
if (!is<RenderMathMLBlock>(numerator))
return nullptr;
return downcast<RenderMathMLBlock>(*numerator).unembellishedOperator();
}
void RenderMathMLFraction::layout()
{
updateFromElement();
// Adjust the fraction line thickness for the zoom
if (lastChild() && lastChild()->isRenderBlock())
m_lineThickness *= ceilf(gFractionBarWidth * style().fontSize());
RenderMathMLBlock::layout();
}
void RenderMathMLFraction::paint(PaintInfo& info, const LayoutPoint& paintOffset)
{
RenderMathMLBlock::paint(info, paintOffset);
if (info.context().paintingDisabled() || info.phase != PaintPhaseForeground || style().visibility() != VISIBLE)
return;
RenderBox* denominatorWrapper = lastChildBox();
if (!denominatorWrapper || !m_lineThickness)
return;
IntPoint adjustedPaintOffset = roundedIntPoint(paintOffset + location() + denominatorWrapper->location() + LayoutPoint(0, m_lineThickness / 2));
GraphicsContextStateSaver stateSaver(info.context());
info.context().setStrokeThickness(m_lineThickness);
info.context().setStrokeStyle(SolidStroke);
info.context().setStrokeColor(style().visitedDependentColor(CSSPropertyColor));
info.context().drawLine(adjustedPaintOffset, roundedIntPoint(LayoutPoint(adjustedPaintOffset.x() + denominatorWrapper->offsetWidth(), adjustedPaintOffset.y())));
}
Optional<int> RenderMathMLFraction::firstLineBaseline() const
{
if (RenderBox* denominatorWrapper = lastChildBox())
return Optional<int>(denominatorWrapper->logicalTop() + static_cast<int>(lroundf((m_lineThickness + style().fontMetrics().xHeight()) / 2)));
return RenderMathMLBlock::firstLineBaseline();
}
}
#endif // ENABLE(MATHML)
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